Shadowlands datamining has shown that as we predicted, Blizzard has made it that Mueh’zala “whispered” to Vol’jin to make Sylvanas warchief.
But originally, the cutscene line about “the spirits whisper a name” was just a throwaway line. We also know, because it runs directly contrary to “A Good War”, that the idea of Sylvanas starting the war to kill people because when people die she gains power was a later addition.
Remove these post-hoc rationalizations, and you get a clearer picture. In a time of extreme crisis, Vol’jin chose as his successor the Horde leader who had the most military experience, the one who he knew would ruthlessly pursue victory at all costs. (By comparison, around this time, General Saurfang was making suicidal trips to the Broken Shore in hopes that some random demon would off him. He was old, mentally addled, and obviously unfit for office. Vol’jin was not dumb enough to make him warchief.)
He may have taken a gamble due to Sylvanas’s past behavior, but remember that although Vol’jin gets whitewashed, he was himself a pretty nasty guy who practiced dark voodoo and served a loa of death. He also had no part in orcish “honor” culture. After the Broken Shore, the Legion seemed like it was about to destroy everything. It would be completely in-character for Vol’jin to believe that Sylvanas was, as he said, the most capable person to lead in that situation. The only other viable choices were Lor’themar and Eitrigg. Lor’themar was too disconnected and Eitrigg is a fraction of Sylvanas’s ancient age, with a fraction of her experience and power.
Logically, there was no need for a deus ex machina (manipulation by Mueh’zala) to make Sylvanas his successor, and the pushing of this plot device makes for a less interesting story -- no flawed or interesting choices, just two stark sides and the postmortem whitewashing of a sinister troll shadow hunter.
Mod Edit: This thread is closed.